Improvement in metallic compositions for bearings of machinery



UNITED STATES P TENT OFFICE.

I, s. HILL, or nos'ros, AND J. vmxos, or 'raosrox, .i mssacnusnr'rs.

IMPROVEMENT ,IN METALLIC COMPOSITIONS FOR BEARINGS 0F MaCHiNEliY, &c.

' Specification forming part of Letters Patent No. 3.896,data-dfllminary ill, 143.

To all whom it mug concern:

13c it .known that we, Ixcm-zasn HILL, of Boston, in the county ofSuii'olk and State of Massachusetts, and ,losiarir DIXON, of

Taunton, in vthe county of Bristol and Stateal'oresaid, h re discovereda new and useful Metallic Composition for the Hearing and fearingSurfaces of Machinery, or a new and useful method of preparing zinc sothat it may be used for such bearings and surfaces; and wedo herebydeclare that the following is a full and exact specification ofithes'everal ingredients and their n'oportions, and of the manner ofadmixing or compouifdin g the same, as well as the claim for which wesolicit Letters Patent.

Our composition consists mostly of zinc (which, as is well known,belongs to the classof cheaper metals) hardened by being compounded withwhat we denominate a f hardening composition. fl'his latter compositionis formed ofthe following metals mixed in a state of fusion in theproportions hereinafter specitied viz., fifteen parts of tin tothirty-two parts of copper.

This composition, in a state of fusion, is to.

be admixed with molten zincand tin (although tin is not absolutelyessential) in the proportion of two parts of the said hardeningcomposition to nineteen parts of zinc and'froin three to five parts oftin, according 'to the peculiar purpose for which the com position is tobe used, the tin specified as to be added last having the tendency torender the compound, when cold, more or less ductile, according to thequantity of thesame incorporated therewith. The metal formed without theaddition of the last-named proportion of tin, hen brolgen, will have theappearance of cast-steel of a coarse quality but the addition ofthe tinwill'make it stronger and cause it to be liner in grain, until fourparts of the same be added, whcn thc appearance of the metal, on itsbeing broken, will he like that of line cast-steel, and more closely resembling the same than any other metal.

The great strength of the composition, combined with a certain degree ofsoftness which it-possesses, renders it highly useful in theconstruction of bearings for rubbing surfaces of machinery, as it iscapable of resisting for a,

great length of time the effects of wear and at trition. The largeproportion of zinc used in forming the compound renders'its use in themechanic arts much less expensive than' the metals ordinarily employedfor these purposes, the cost being much less than any other compositionwhere copper and tin are the princi pal metals used.

What we claim as our discovery, and desire I

